Channel reciprocity matrix determination in a wireless MIMO communication system

a communication system and reciprocity matrix technology, applied in the field of wireless communication systems, can solve the problems of inability to operate, consuming battery life, and complicated and drawn-out procedure for channel response determination

Inactive Publication Date: 2007-01-18
BELL NORTHERN RES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Determination of the channel response can be a complicated and drawn out procedure, consuming battery life and diverting the operation of the transceiver from its data transfer operations.
Heretofore, such operation has not been possible because of the unique and differing RF characteristics of the STA and the AP.

Method used

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  • Channel reciprocity matrix determination in a wireless MIMO communication system
  • Channel reciprocity matrix determination in a wireless MIMO communication system
  • Channel reciprocity matrix determination in a wireless MIMO communication system

Examples

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Embodiment Construction

[0027]FIG. 1 is a schematic block diagram illustrating a communication system 10 that includes a plurality of base stations and / or access points 12, 16, a plurality of wireless communication devices 18-32 and a network hardware component 34. Note that the network hardware 34, which may be a router, switch, bridge, modem, system controller, et cetera provides a wide area network connection 42 for the communication system 10. Further note that the wireless communication devices 18-32 may be laptop host computers 18 and 26, personal digital assistant hosts 20 and 30, personal computer hosts 24 and 32, and / or cellular telephone hosts 22 and 28. The details of the wireless communication devices will be described in greater detail with reference to FIG. 2.

[0028] Wireless communication devices 22, 23, and 24 are located within an independent basic service set (IBSS) area and communicate directly (i.e., point to point). In this configuration, these devices 22, 23, and 24 may only communica...

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Abstract

Operating a wireless MIMO system to determine forward and reverse channel reciprocity matrices relating a first wireless MIMO device and a second wireless MIMO device of the wireless MIMO system includes, during each of a plurality of time intervals, determining a forward composite channel estimates and a reverse composite channel estimates between the first wireless MIMO device and the second wireless MIMO device to yield a plurality of forward composite channel estimates and a plurality of reverse composite channel estimates. Operation continues with creating a mathematical relationship between the plurality of forward composite channel estimates and the plurality of reverse composite channel estimates and the forward and reverse channel reciprocity matrices. Operation concludes with finding a solution to the mathematical relationship between the plurality of forward composite channel estimates and the plurality of reverse composite channel estimates to yield the forward reciprocity matrix and the reverse channel reciprocity matrix.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims priority to U.S. Provisional Patent Application Ser. No. 60 / 698,691, filed Jul. 13, 2005, which is incorporated herein by reference for all purposes.BACKGROUND OF THE INVENTION [0002] 1. Technical Field of the Invention [0003] This invention relates generally to wireless communication systems and more particularly to channel equalization in wireless Multi-Input-Multi-Output (MIMO) communication systems. [0004] 2. Description of Related Art [0005] Communication systems are known to support wireless and wire lined communications between wireless and / or wire lined communication devices. Such communication systems range from national and / or international cellular telephone systems to the Internet to point-to-point in-home wireless networks. Each type of communication system is constructed, and hence operates, in accordance with one or more communication standards. For instance, wireless communication systems may opera...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04Q7/20
CPCH04B7/0413H04L1/0025H04L25/0204H04L2025/03802H04L25/03292H04L27/2601H04L2025/03426H04L25/0242
Inventor HANSEN, CHRISTOPHER J.
Owner BELL NORTHERN RES LLC
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